...This conclusion is warranted if we examine what would happen tofrequency distributions if the variables or oscillators regulatingtiming were linked... 
Richard F. Johnston 「The Breeding Birds of Kansas」
...The variables found in them are all of short period and the changes of light show a noteworthy tendency to uniformity...
Garrett Serviss 「Curiosities of the Sky」
...Yet, again, a third class of doublestars has made itself known in the “Algol variables...
E. Walter Maunder 「Are the Planets Inhabited?」
...The number of known variables of the Algol type is, so far, small; notmuch indeed over thirty...
Cecil G. Dolmage 「Astronomy of To-day」
...—On the other hand, some variablestars present an almost perfect regularity, repeatingtheir changes time after time with a precision like that ofclockwork...
George C. Comstock 「A Text-Book of Astronomy」
...An equation with four variables usually requires space of fourdimensions for its geometrical interpretation, and so on...
Oliver Lodge 「Pioneers of Science」
...The two neighboring variables just referred to areinteresting...
Garrett Serviss 「Pleasures of the telescope」
...It must, therefore, be exceedinglyerratic in its changes, resembling rather the temporarystars than the true variables...
Garrett Serviss 「Pleasures of the telescope」
...The variables T and R are oflittle interest to us, for they never become bright enoughto be seen without the aid of a telescope...
Garrett Serviss 「Pleasures of the telescope」
...27 stars having this spectrum are variables of long period of thesame type as Md...
Carl Vilhelm Ludvig Charlier 「Lectures on Stellar Statistics」
...Are all other stars constant in brightness? The example ofMira Ceti and of other known variables makes this at least doubtful...
Edward Singleton Holden 「Sir William Herschel: His Life and Works」
...The chief attraction in Perseus is the changeful andwonderful β, or Algol, the great typical star among theshort-period variables...
Garrett Serviss 「Pleasures of the telescope」
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